Okay fellow Teeners I'll try to keep this brief, long story short my fuel system is semi butchered and has a leaky rectangular fuel pump that appears to be out of a tractor, 30R7 fuel hose installed in the mid-nineties that's drying out and begining to split, or in one case appears to be MELTING! Standard style hose clamps instead of solid band clamps, zip tied fuel lines instead of clamped and two 3 foot lengths of hose pieced togehter where there should be one 6 foot length!!! AHHHHH
Now to sort this all out...
First off my 914 Info:
It's a 1972 with original 1.7L block with a 1.8 head and so on so it's actually 1910CCs. Dual Dellorto carbs each with one incoming fuel line from a brass T-juntion block supported by the fuel hose currently, no return vaccum lines, and currently a 2 port 1 inlet/1 outlet fuel pump setup loosely zip tied to the factory right angle tabs intended to hold the clear box-style in-line fuel filter. The fuel filter is 6 inches upstream from the fuel pump zip tied behind the passenger side firewall in the corner south of the "hell-hole" area allthough the battery is now housed in the front trunk and Red-Top Optima so it can be safely sealed in 100%.
Also perhaps important to note there is no 7-9MM "step-up" hose I've previously read about present in the system and not sure whether I'll need that if I'm re-doing everything with the same diameter line front to back?
More Importantly, The QUESTIONS!
In an attempt to keep chaos organized I'm going to number each question and if you can help resolve that question please reference the number and once it's 100% figured out I'll move it under "Resolved". Thanks!
Unresolved:
1. Will 5/16 SAE 30R9 (Teflon lined aka 50 times less permeable to fuel vapors than the more abundant 30R7 spec) fuel hose that's .56" outer diameter be able to be used front-to-back from the gas tank to a front mounted fuel pump; through the center tunnel, into a fuel filter somewhere in the system etc, or is .56" too large to safely fit through the firewall fore and aft and not rub?
2. Does anyone have large, clear, high resolution photos of the factory mounting location for a 75-76 front mounted fuel pump?
3. Will I need to drill holes or create mounting tabs in the front to mount a fuel pump in a factory-esk 75-76 914 fashion or are mounting provisions already present? (also FYI would like to keep it out of the front trunk cargo area; battery, compact 911 spare, and front oil cooler shroud already take up enough space, however the whole heater core/blower unit has been removed but I do intend to re-install the windsheild wiper fluid tank and an electric 914-6 pump to keep in mind for space)
4. Where can I find a proper OEM style Bosch (or superior) in-line fuel filter? NOTE: It needs to have the same inlet-outlet diameter as I'm hoping to use 5/16" hose throughout.
6. Where can I find a proper OEM style Bosch 2-port fuel pump that's warranted in some way, not from China, possibly not NOS as I've heard too many stories of seals drying out from sitting on a shelf, preferably not very loud, and also not super expensive as I'm only a college student of limited means after all.
7. Where can I find an OEM style fuel pump mounting bracket if it's not included with a new pump?
8. Where can I find OEM style solid fuel line band clamps that fit 5/16 (.056 OD) line, perferably in stainless steel?
10. Do the early/late 914 fuel pumps vary; with the later having a higher PSI to compensate for the increased distance for the fuel to travel under pressure? If yes, then how can I assure I get the correct one?
11. Assuming I order the right combo of fuel pump, filter, etc, will I be able to use 5/16" ID line throughout and avoid the 7-9MM stepped OEM hose which only meets a lower SAE rating/spec?
13. It won't particularly matter to me because locally I can only buy 30R9 fuel hose in a 25' reel; but for the sake of other teeners looking to revamp their fuel system, approximately (rounding up obviously) how many feet of fuel line should be purchased to replumb the system from front to back?
Resolved:
5. Assuming I'm able to relocate the fuel pump to the front mimicking 75-76 914s, where should the fuel filter be mounted in the system?
20 questions, too early to give you all your answers if I even could read for that long without falling asleep.
pelicanparts.com for you 914 oem serch ect.. filters.'76pump. and the like, hos ehose clamps ect.. search the site if you ccan't find it call them.. the have cow hides to hose clamps..
mount filters before pumps unless you like buying pumps..
I do not know about 100 psi teflon fuel hose of ss hose clamps i am sure they are on the internet somewhere.. google google google
I do not recomend "avoiding" metric step down with 5/16" hose.. to loose in areas ect.. leakage fire stinky
yes late and early pump are different but i do not think there psi varies as imporatant as
the fuel pressure regulator
remains the same in your fuel system..
use same gauge wire that is already to your fuel pump for rewirng in a different further location.
It sounds like your system was home engineered, but that can be OK for a while. I'd save myself a lot of work and searching, and simply purchase a low pressure fuel pump from one of the vendors ( you don't want a high pressure Bosch pump, and don't want to pay for a low pressure Bosch pump). I used a pump purchased from MidAmerica Motorworks that was made for a VW. It's small, cylindrical, and can be mounted with rubber isolators under the steering rack in front. A fuel filter can be mounted between the tank and the fuel pump (why pump unfiltered gas?). One of our members makes nice stainless fuel lines that should be used in the center tunnel. Otherwise, braided fuel line can be used, but it is expensive. I've also found Pegasus Racing to be a good source of small parts, lines, clamps, etc.
If you're running carbs, you don't need a return fuel line.
Enjoy your project, be careful, and safe.
5/16 th inch hose works just fine, use the solid clamps and be happy, the benifit of the 30R9 lined hose is worth spending money on, as teh new gasolines eat up the 30R7 an interesting note that in california 30R7 hose is now being marked as NOT suitable for Fuel Injection. thats right, it used to be used for Fi, but now I am seeing 30R7 hose being marked for no FI. I guess the 30R7 can be damaged by teh new gas so fast that they dont want high pressure runing thru it anymore.
frankly I'd reinstall your pump were it came from the factory, these cars are becoming more of a collector car, where originality can really help value. there is little if any benift from moving the stuff around, stick with stock if you can.
HighPerfromance House (650) 3674-6234 shoudl have all the parts you need.
the stepped hose really needs to be used, your going between two different diameters, you need teh steppe hose, A side benifit from keeping teh pump in the rear location is that teh stepped hose will NOT be pressurzied, as it is before the pump!
30R9 can be found at many kragens or Pepboys, but you may have to go in back and look for your self for the labling. the counter foks may not be aware of the differences
hose clamps can be had at Highperfomance house or any parts store should have them, I use Ideal brand, you can also get stainless ones at West Marine they have at least two grades of clamps the high grade is like near ten X price, but is all stainless and very nice the low grade ones will however work just fine so long as they are solid band, you should be good.
Still no luck finding specific pieces like the solid SS band clamps!?
Any 914 fuel system experts lurking about?
I'd try some local parts stores....I just got some solid hose clamps from a wholesaler that I buy parts from. Ask for "fuel injection clamps". That's what I got....
Still no luck finding anything locally Perhaps someone knows where to find most of these parts online?
914 is ready to get out on the road if it weren't for the PO's botched fuel line install and leaky fuel pump!
I used a "kit" from pelican parts about 10 years ago. I'm sure AA has something to offer and you'll at least wind up with the piece of mind that you have the correct parts...
Try GPR too. Good guys.
Okay folks, after reading this thread: http://www.914world.com/bbs2/index.php?showtopic=107813
That pretty much resolves the question of whether or not to run rubber line through the tunnel... which it looks like a definite NO!
That being said I still feel like I should absolutely replace the original plastic line through the tunnel that's been in place since 1972... it just looks and feels far to brittle...
Any suggestions for an OEM style replacement there?
If I can get ahold of the proper OEM parts I may just take it back to factory and leave the fuel pump in the rear (although still replace it with a new Bosch unit) so I can get this 914 back on the road!
I know some people have said vapor lock is more of a concern than others? If I were to re-do the pump & filter in factory location I suppose I could heat wrap the pump and as an additional perk I could use the current mounts & wouldn't have to figure out how to mount them up front...
My only concern in keeping with the factory setup is using the lesser grade rubber tapered hose that will break down quicker than the 30R9 but I suppose I can just order two of those from Pelican so I have one on hand in the event of a failure/split?
http://www.tangerineracing.com/stainlessFuelLines.htm
Even though it isn't listed, I also have 30R9 hose.
An FI pump is wrong for carbs. You need a low pressure pump.
Since you have carbs now, and no pump, I recommend the package for carbs at the bottom of the web page. You can easily add the other lines if and when you convert to EFI.
Using the step-down adapter piece does mean you will have another piece of hose with clamps at each end. I would rather have that than use the wrong size hose.
Depending on where you put the fuel pump, the step-down piece goes in different locations.
The best setup for you is probably with a front mounted pump. The adapter goes right after the tank and before the filter in that case.
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